As per North Indian Kundli Matching and South Indian Horoscope matching, the union is inauspicious and the girl is a Manglik while the boy is not and therefore has a Manglik dosha.
However if you wish to have a scientific horoscope matching as detailed out in my blog, you can come through Paid Consultation.
No, if a dosh is there, it never gets cancelled. She has Mars in her 8th house. As per traditional astrology, it is a solid dosha. But scientific astrology does not endorse it and many other superstitions. Read my article “Myths and misconceptions in Astrology”